plot.py

import numpy as np
import matplotlib.pyplot as plt

results = [128.404195237, 97.3462196942, 97.32592423, 77.4317551694]
clusters_points = [2, 3, 4, 5]
plt.xlim([2, 5])
plt.ylim([50, 140])

plt.plot(clusters_points, results, 'go') # bolinha verde
plt.plot(clusters_points, results, 'k:', color='blue') # linha pontilhada

plt.grid(True)
plt.xlabel("Clusters")
plt.ylabel("Error")
plt.show()